It's been a few weeks since I've done a scan, and last night when I went to plug my 360 controller into one of my front USB ports, my computer restarted on its own. When it came back up, it said Windows had restored from a serious error. I tried to run Scandisk at this point (using the method I always have in the past -- selecting Properties on the drive, Tools, Scandisk, and checking both options), but it said it couldn't run Scandisk. I'm not sure if the reason is related to the "serious error" that occurred, but I sure don't want to lose my ability to do periodical scans. I scanned for viruses/malware last night, using both McAfee and Malwarebytes, but neither program detected anything. Not sure how to proceed at this point.

Thanks, man. I'm guessing it just ran the scan through the command window. It said it found problems with the file system; run CHKDSK with the /F option to correct these. What does that entail exactly?

My computer didn't come with a Windows disk. The deal with that was they allow you to make one copy of everything, which at the time I had to back-up onto something like 15 CDs because the computer came stock with just a CDR -- no DVDR. I wouldn't even know where to begin as far as utilizing what's there. I was able to scan, and though I also was able to use CHKDSK in /F, when I restarted my computer, it didn't seem to run Scandisk.

Thanks, man. I'm guessing it just ran the scan through the command window. It said it found problems with the file system; run CHKDSK with the /F option to correct these. What does that entail exactly?

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Do the same procedure, except this time write

chkdsk /F

and press Enter. It'll probably say that the drive is busy or something. Type "Y" and press enter. It'll ask you to reboot, do it and it should run on the next startup